text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
   * Copyright (c) 2022, the SerenityOS developers.
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #include "EllipseTool.h"
  #include "../ImageEditor.h"
  #include "../Layer.h"
  #include <LibGUI/Action.h>
  #include <LibGUI/BoxLayout.h>
  #include <LibGUI/Label.h>
  #include <LibGUI/Menu.h>
  #include <LibGUI/Painter.h>
  #include <LibGUI/RadioButton.h>
  #include <LibGUI/TextBox.h>
  #include <LibGUI/ValueSlider.h>
  #include <LibGfx/Rect.h>
  
  namespace PixelPaint {
  
  void EllipseTool::draw_using(GUI::Painter& painter, Gfx::IntPoint const& start_position, Gfx::IntPoint const& end_position, int thickness)
  {
      Gfx::IntRect ellipse_intersecting_rect;
      if (m_draw_mode == DrawMode::FromCenter) {
          auto delta = end_position - start_position;
          ellipse_intersecting_rect = Gfx::IntRect::from_two_points(start_position - delta, end_position);
      } else {
          ellipse_intersecting_rect = Gfx::IntRect::from_two_points(start_position, end_position);
      }
  
      switch (m_fill_mode) {
      case FillMode::Outline:
          painter.draw_ellipse_intersecting(ellipse_intersecting_rect, m_editor->color_for(m_drawing_button), thickness);
          break;
      case FillMode::Fill:
          painter.fill_ellipse(ellipse_intersecting_rect, m_editor->color_for(m_drawing_button));
          break;
      default:
          VERIFY_NOT_REACHED();
      }
  }
  
  void EllipseTool::on_mousedown(Layer* layer, MouseEvent& event)
  {
      if (!layer)
          return;
  
      auto& layer_event = event.layer_event();
      if (layer_event.button() != GUI::MouseButton::Primary && layer_event.button() != GUI::MouseButton::Secondary)
          return;
  
      if (m_drawing_button != GUI::MouseButton::None)
          return;
  
      m_drawing_button = layer_event.button();
      m_ellipse_start_position = layer_event.position();
      m_ellipse_end_position = layer_event.position();
      m_editor->update();
  }
  
  void EllipseTool::on_mouseup(Layer* layer, MouseEvent& event)
  {
      if (!layer)
          return;
  
      if (event.layer_event().button() == m_drawing_button) {
          GUI::Painter painter(layer->currently_edited_bitmap());
          draw_using(painter, m_ellipse_start_position, m_ellipse_end_position, m_thickness);
          m_drawing_button = GUI::MouseButton::None;
          layer->did_modify_bitmap();
          m_editor->update();
          m_editor->did_complete_action();
      }
  }
  
  void EllipseTool::on_mousemove(Layer*, MouseEvent& event)
  {
      if (m_drawing_button == GUI::MouseButton::None)
          return;
  
      m_draw_mode = event.layer_event().alt() ? DrawMode::FromCenter : DrawMode::FromCorner;
  
      if (event.layer_event().shift())
          m_ellipse_end_position = m_ellipse_start_position.end_point_for_aspect_ratio(event.layer_event().position(), 1.0);
      else if (m_aspect_ratio.has_value())
          m_ellipse_end_position = m_ellipse_start_position.end_point_for_aspect_ratio(event.layer_event().position(), m_aspect_ratio.value());
      else
          m_ellipse_end_position = event.layer_event().position();
  
      m_editor->update();
  }
  
  void EllipseTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
  {
      if (!layer || m_drawing_button == GUI::MouseButton::None)
          return;
  
      GUI::Painter painter(*m_editor);
      painter.add_clip_rect(event.rect());
      auto preview_start = m_editor->content_to_frame_position(m_ellipse_start_position).to_type<int>();
      auto preview_end = m_editor->content_to_frame_position(m_ellipse_end_position).to_type<int>();
      draw_using(painter, preview_start, preview_end, AK::max(m_thickness * m_editor->scale(), 1));
  }
  
  void EllipseTool::on_keydown(GUI::KeyEvent& event)
  {
      Tool::on_keydown(event);
      if (event.key() == Key_Escape && m_drawing_button != GUI::MouseButton::None) {
          m_drawing_button = GUI::MouseButton::None;
          m_editor->update();
          event.accept();
      }
  }
  
  GUI::Widget* EllipseTool::get_properties_widget()
  {
      if (!m_properties_widget) {
          m_properties_widget = GUI::Widget::construct();
          m_properties_widget->set_layout<GUI::VerticalBoxLayout>();
  
          auto& thickness_container = m_properties_widget->add<GUI::Widget>();
          thickness_container.set_fixed_height(20);
          thickness_container.set_layout<GUI::HorizontalBoxLayout>();
  
          auto& thickness_label = thickness_container.add<GUI::Label>("Thickness:");
          thickness_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
          thickness_label.set_fixed_size(80, 20);
  
          auto& thickness_slider = thickness_container.add<GUI::ValueSlider>(Orientation::Horizontal, "px");
          thickness_slider.set_range(1, 10);
          thickness_slider.set_value(m_thickness);
  
          thickness_slider.on_change = [&](int value) {
              m_thickness = value;
          };
          set_primary_slider(&thickness_slider);
  
          auto& mode_container = m_properties_widget->add<GUI::Widget>();
          mode_container.set_fixed_height(46);
          mode_container.set_layout<GUI::HorizontalBoxLayout>();
          auto& mode_label = mode_container.add<GUI::Label>("Mode:");
          mode_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
          mode_label.set_fixed_size(80, 20);
  
          auto& mode_radio_container = mode_container.add<GUI::Widget>();
          mode_radio_container.set_layout<GUI::VerticalBoxLayout>();
          auto& outline_mode_radio = mode_radio_container.add<GUI::RadioButton>("Outline");
          auto& fill_mode_radio = mode_radio_container.add<GUI::RadioButton>("Fill");
  
          outline_mode_radio.on_checked = [&](bool) {
              m_fill_mode = FillMode::Outline;
          };
          fill_mode_radio.on_checked = [&](bool) {
              m_fill_mode = FillMode::Fill;
          };
  
          outline_mode_radio.set_checked(true);
  
          auto& aspect_container = m_properties_widget->add<GUI::Widget>();
          aspect_container.set_fixed_height(20);
          aspect_container.set_layout<GUI::HorizontalBoxLayout>();
  
          auto& aspect_label = aspect_container.add<GUI::Label>("Aspect Ratio:");
          aspect_label.set_text_alignment(Gfx::TextAlignment::CenterLeft);
          aspect_label.set_fixed_size(80, 20);
  
          m_aspect_w_textbox = aspect_container.add<GUI::TextBox>();
          m_aspect_w_textbox->set_fixed_height(20);
          m_aspect_w_textbox->set_fixed_width(25);
          m_aspect_w_textbox->on_change = [&] {
              auto x = m_aspect_w_textbox->text().to_int().value_or(0);
              auto y = m_aspect_h_textbox->text().to_int().value_or(0);
              if (x > 0 && y > 0) {
                  m_aspect_ratio = (float)x / (float)y;
              } else {
                  m_aspect_ratio = {};
              }
          };
  
          auto& multiply_label = aspect_container.add<GUI::Label>("x");
          multiply_label.set_text_alignment(Gfx::TextAlignment::Center);
          multiply_label.set_fixed_size(10, 20);
  
          m_aspect_h_textbox = aspect_container.add<GUI::TextBox>();
          m_aspect_h_textbox->set_fixed_height(20);
          m_aspect_h_textbox->set_fixed_width(25);
          m_aspect_h_textbox->on_change = [&] { m_aspect_w_textbox->on_change(); };
      }
  
      return m_properties_widget.ptr();
  }
  
  }
  